package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.exception.NoStockException;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.vo.*;
import com.rabbitmq.client.Channel;
import lombok.Data;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;


@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    WareSkuDao wareSkuDao;

    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    RabbitTemplate rabbitTemplate;

    @Autowired
    WareOrderTaskDetailService orderTaskDetailService;

    @Autowired
    WareOrderTaskService orderTaskService;

    @Autowired
    OrderFeignService orderFeignService;


    public void unlockStock(Long skuId, Long wareId, Integer skuNum, Long taskDetailId){
        // 库存解锁
        wareSkuDao.unlockStock(skuId, wareId, skuNum);
        // 更新库存工作单的状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        entity.setLockStatus(2);    // 变为已解锁
        orderTaskDetailService.updateById(entity);
    }

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> wrapper = new QueryWrapper<>();

        String skuId = (String) params.get("skuId");
        if(!StringUtils.isEmpty(skuId)){
            wrapper.eq("sku_id",skuId);
        }

        String wareId = (String) params.get("wareId");
        if(!StringUtils.isEmpty(wareId)){
            wrapper.eq("ware_id",wareId);
        }

        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                wrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1、判断如果还没有这个库存记录新增
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if(entities == null || entities.size() == 0){
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            //TODO 远程查询sku的名字，如果失败，整个事务无需回滚
            //1、自己catch异常

            //TODO 还可以用什么办法让异常出现以后不回滚？
            try {
                R info = productFeignService.info(skuId);
                Map<String,Object> data = (Map<String, Object>) info.get("skuInfo");
                if (info.getCode() == 0){
                    skuEntity.setSkuName((String) data.get("skuName"));
                }
            }catch (Exception e){

            }
            wareSkuDao.insert(skuEntity);
        }else {
            wareSkuDao.addStock(skuId,wareId,skuNum);
        }
    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {
        if (skuIds!=null && skuIds.size() > 0){
            List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
                SkuHasStockVo vo = new SkuHasStockVo();

                Long count = baseMapper.getSkuStock(skuId);

                vo.setSkuId(skuId);
                vo.setHasStock(count==null?false:count > 0);
                return vo;
            }).collect(Collectors.toList());
            return collect;
        }
        return null;
    }

    /**
     * 为某个订单锁定库存
     *
     * (rollbackFor = NoStockException.class)
     * 默认只要是运行时异常都会回滚
     *
     * 库存加锁的场景
     * 1）、下订单成功，订单过期没有支付被系统自动取消、被用户手动取消。都要解锁库存
     * 2）、下订单成功，库存锁定成功，接下来业务调用失败导致订单回滚，之前锁定的就要自动解锁
     * @param vo
     * @return
     */
    @Transactional
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /**
         * 保存库存工作单的详情
         * 追溯
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);


        // 1、按照下单的收货地址，找到一个就近仓库，锁定仓库

        // 1、找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setNum(item.getCount());
            stock.setSkuId(skuId);
            // 查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());

        // 2、锁定仓库  锁x号仓库的x号sku num个库存
        for (SkuWareHasStock hasstock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasstock.getSkuId();
            List<Long> wareIds = hasstock.getWareId();
            if (wareIds == null || wareIds.size() == 0){
                // 没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }

            // 1、如果每一个商品都锁定成功，将当前商品锁定了几件的工作单记录发给MQ
            // 2、锁定失败。前面保存的工作单信息就回滚了。发送出去的消息，即使要解锁记录，由于去数据库查不到id，所以就不用解锁
            //    1：1-2-1   2：2-1-2     3：3-1-1（x）
            for (Long wareId : wareIds){
                // 成功就返回1，失败就返回0
                Long count = wareSkuDao.lockSkuStock(skuId, wareId, hasstock.getNum());
                if (count == 1){
                    // 成功
                    skuStocked = true;
                    // 告诉MQ库存锁定成功
                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null, skuId, "", hasstock.getNum(), taskEntity.getId(), wareId, 1);
                    orderTaskDetailService.save(entity);
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    // 只发id 不行，需要发库存详情，防止回滚后找不到数据
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(entity, stockDetailTo);
                    lockedTo.setDetailTo(stockDetailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", lockedTo);
                    break;
                }else {
                    // 当前仓库锁定失败，重试下一个仓库
                }
            }
            if (skuStocked == false){
                // 当前商品在所有仓库都没有库存
                throw new NoStockException(skuId);
            }
        }

        // 3、肯定全部都是锁定成功过的
        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {
        StockDetailTo detail = to.getDetailTo();
        Long detailId = detail.getId();
        // 解锁
        // 1、查询数据库，关于这个订单的锁定库存信息
        // 有：证明库存锁定成功
        //      解锁：订单情况。
        //          1、没有订单。必须解锁
        //          2、有订单。不是解锁库存
        //              订单状态：已取消。解锁库存
        //                      没取消的，不能解锁
        // 没有：库存锁定失败了，库存回滚了。这种情况无需解锁
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
        if(byId != null){
            // 解锁
            Long id = to.getId();
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn();   // 根据订单号查询订单状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if(r.getCode() == 0){
                // 订单数据返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>(){});
                if (data == null || data.getStatus() == 4){
                    // 订单已经被取消了。才能解锁库存
                    if (byId.getLockStatus()==1){
                        // 当前库存工作单详情，状态1已锁定但是未解锁才可以解锁
                        unlockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detailId);
                    }
                }
            }else {
                // 消息拒绝以后重新放到队列里面，让人继续消费解锁
                throw new RuntimeException("远程服务调用失败");
            }
        }else {
            // 无需解锁
        }

    }


    // 防止订单服务卡顿，导致订单状态一直改不了，库存消息优先到期，查订单状态新建状态，什么都不做就走了。
    // 导致卡顿的订单，永远不能解锁库存
    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        // 查一下最新库存的状态，防止重复解锁库存
        WareOrderTaskEntity task = orderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        // 按照工作单的id找到所有 没有解锁的库存，进行解锁
        List<WareOrderTaskDetailEntity> entities = orderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>().eq("task_id", id).eq("lock_status", 1));
        // unlockStock(Long skuId, Long wareId, Integer skuNum, Long taskDetailId)
        for (WareOrderTaskDetailEntity entity : entities) {
            unlockStock(entity.getSkuId(), entity.getWareId(), entity.getSkuNum(), entity.getId());
        }

    }

    @Data
    class SkuWareHasStock{
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }

}